Notice that Jesus critiqued the transactional motivation of these devotees. If you do your charitable deed before men to be seen of them, then you have your reward. If you pray on the street corners to be seen by men then you have your reward. If you put on a sad countenance and disfigure your face in order to appear to men to be fasting then you have your reward. Jesus announced that the present gratification cancelled the eternal value of all of these observances. In fact, these public displays had nothing to do with God.